Mine was a bartender at a karaoke bar I went to. Didn't really stutter while singing, but did when ordering drinks and small talk. Most places like that have regulars so you can get an idea of how people are after a while hanging casually. Some regulars build up complex drama, so be mindful of that. The people are also drunk or don't expect anyone to be good. Slurred speech and other antics are common. No pressure or competition.